When 600 mL of $0.2 \mathrm{M} \mathrm{HNO}_3$ is mixed with 400 mL of 0.1 M NaOH solution in a flask, the rise in temperature of the flask is $\_\_\_\_$ $\times 10^{-2}{ }^{\circ} \mathrm{C}$. (Enthalpy of neutralisation $=57 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and Specific heat of water $\left.=4.2 \mathrm{JK}^{-1} \mathrm{~g}^{-1}\right)($ Neglect heat capacity of flask $)$